This might be the thread you are referring to Daren
http://www.imperialgunneryforum.com/t3495-top-loader-case-to-secure-bubbles?highlight=top+loader
Hope this helps you out Tarkin
If the bubbles are too far gone there's not much point to paying afa so much - that top loader method seems to work quite well and is cheap
found a little more in depth description here : http://forum.rebelscum.com/t1117762/